CN1993903B - Method and system of radio communications - Google Patents

Method and system of radio communications Download PDF

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Publication number
CN1993903B
CN1993903B CN2005800266589A CN200580026658A CN1993903B CN 1993903 B CN1993903 B CN 1993903B CN 2005800266589 A CN2005800266589 A CN 2005800266589A CN 200580026658 A CN200580026658 A CN 200580026658A CN 1993903 B CN1993903 B CN 1993903B
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China
Prior art keywords
base station
noise
interference
link
radio communication
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CN1993903A (en
Inventor
B·哈格曼
T·奥斯特曼
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Telefonaktiebolaget LM Ericsson AB
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Telefonaktiebolaget LM Ericsson AB
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W24/00—Supervisory, monitoring or testing arrangements
    • H04W24/02—Arrangements for optimising operational condition
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W36/00—Hand-off or reselection arrangements
    • H04W36/0005—Control or signalling for completing the hand-off
    • H04W36/0055—Transmission or use of information for re-establishing the radio link
    • H04W36/0069—Transmission or use of information for re-establishing the radio link in case of dual connectivity, e.g. decoupled uplink/downlink
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W52/00—Power management, e.g. TPC [Transmission Power Control], power saving or power classes
    • H04W52/04—TPC
    • H04W52/18—TPC being performed according to specific parameters
    • H04W52/22—TPC being performed according to specific parameters taking into account previous information or commands
    • H04W52/221—TPC being performed according to specific parameters taking into account previous information or commands using past power control commands
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W52/00—Power management, e.g. TPC [Transmission Power Control], power saving or power classes
    • H04W52/04—TPC
    • H04W52/18—TPC being performed according to specific parameters
    • H04W52/24—TPC being performed according to specific parameters using SIR [Signal to Interference Ratio] or other wireless path parameters
    • H04W52/243—TPC being performed according to specific parameters using SIR [Signal to Interference Ratio] or other wireless path parameters taking into account interferences
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W52/00—Power management, e.g. TPC [Transmission Power Control], power saving or power classes
    • H04W52/04—TPC
    • H04W52/38—TPC being performed in particular situations
    • H04W52/40—TPC being performed in particular situations during macro-diversity or soft handoff
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W36/00—Hand-off or reselection arrangements
    • H04W36/16—Performing reselection for specific purposes
    • H04W36/18—Performing reselection for specific purposes for allowing seamless reselection, e.g. soft reselection
    • H04W36/185—Performing reselection for specific purposes for allowing seamless reselection, e.g. soft reselection using make before break
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W52/00—Power management, e.g. TPC [Transmission Power Control], power saving or power classes
    • H04W52/04—TPC
    • H04W52/30—TPC using constraints in the total amount of available transmission power
    • H04W52/34—TPC management, i.e. sharing limited amount of power among users or channels or data types, e.g. cell loading
    • H04W52/343—TPC management, i.e. sharing limited amount of power among users or channels or data types, e.g. cell loading taking into account loading or congestion level

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  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Mobile Radio Communication Systems (AREA)

Abstract

The present invention relates to communications. More especially it relates to handover of connections. Particularly it relates to soft handover of connections between cells or sectors providing optimized performance in hand over boundary or region balancing various coverage ranges.

Description

The method and system of radio communication
Technical field
The present invention relates to communication.More specifically it relates to the switching of connection.Particularly it relates to the soft handover of the connection between minizone or sector, is provided at the Optimal performance in handoff boundary or the zone.This haves a great attraction in for example CDMA (' code division multiple access ') or WCDMA (' wideband CDMA ') system and the multi-address system based on OFDM (' OFDM ').
Background technology
It is known in the art that connection like this switches in.In direct-cut operation, (old) communication link or path were released before setting up fully at (newly) communication link.Yet, this process very fast and in having the fine designed system of good covering, during normal condition, concerning the user, almost discover less than.On the contrary, in soft handover, communication link is so that subscriber equipment always keeps the such mode of at least one communication link to be abandoned and be established.According to prior art, generally include some hysteresis relevant with direction (hysteresis), so that be used for setting up the level that the required level (level) of (newly) communication path is released or loses greater than (old) communication path.
According to the 3GPP standard, movable group is one group of radio link, and this group radio link involves in the specific communication service between subscriber equipment and the terrestrial radio access network access point simultaneously.
Fig. 1 shows two base stations " BS1 " by radio access network, diversity " BS2 ", user equipment (UE) is switched or the principle of soft handover, and a residential quarter " residential quarter 1 ", " residential quarter 2 " are served in each base station.In the drawings, subscriber equipment " UE " has been set up communication path " path 1 ", " path 2 " with two base stations " BS1 ", " BS2 ".
In the system of prior art, the measurement level that is considered for switch decision is usually included in the power that receives on the pilot channel.In UMTS (' Universal Mobile Telecommunications System '), for example, the level of considering is the received power that is at user equipment (UE) on (master) Common Pilot Channel CPICH.
Fig. 2 is schematically illustrated in when connecting and sets up by base station " BS2 " and in the situation when keeping by another base station " BS1 " simultaneously, locates hysteresis from the received power on the CPICH of two different base station/Node B " BS1/ Node B 1 ", " BS2/ Node B 2 " at subscriber equipment " UE ".The zone that the difference from the transmitting power of base station " BS1 ", " BS2 " that wherein receives is less than or equal to hysteresis " η " is handoff boundary " HOB ".
International Patent Application WO 0232017 has been described a transmitting antenna array about its Fig. 3, and it has used conventional soft handoff scheme.Transmitting power and while UE that base-station node B1 and Node B 2 have reduced them come Determining Weights according to the phase difference between the CPICH signal of launching from two Node B, thereby maximize SINR (' signal and interference+noise ratio ') and launch this weight to Node B.Signal and definite weight that maximizes the SINR of this soft combined signal that then UE goes soft merging to receive from Node B according to weight.
US Patent No. 6011971 discloses the soft direct-cut operation of combination and has identified Power Control Problem about direct-cut operation.
Third generation partner plans (3GPP): Technical Specification Group RadioAccess Network, Physical Layer Procedures, 3G TS 25.214 v3.3.0, France, (in June, 2000 is at the technical specification group radio access network of 3G TS 25.214 v3.3.0 of France's formulation for June 2000, physical layer proce-dures) in, the step-out processing has been described.In brief, the link group that differs from quality is represented as step-out.About up-link power control, MS should turn off its sender during the down link step loss condition.Regularly float at during soft handoff and be positioned at outside the effective range if be used for the reception of any link, then should provide information, so that network can be adjusted down link regularly.
Basically, according to the 3GPP technical specification, the TPC order comprises the bit of an expression increased power or minimizing.Yet the present invention does not get rid of the basic TPC order that comprises more than 1 bit.According to the 3GPP technical specification, at during soft handoff, have so basic TPC bit or TPC order to be used for each related link in addition, it will be integrated in the TPC order.Therefore, the concept of " TPC order " had not only comprised so basic but also TPC order that comprise such merging.About downlink power control, during the step-out period, the TPC order of launching should be set to " 1 ", and namely it should represent increased power.
Third generation partner plans (3GPP): Technical Specification Group RadioAccess Network, Physical Layer-Measurements (FDD), 3GPP TS25.215 v6.0.0, France, (in December, 2000 is at the technical specification group radio access network of the 3GPP TS 25.215v6.0.0 of France's formulation for December 2000, physical layer-measurement (FDD)) in, stipulated that in the 5.2nd joint UTRAN (' universal terrestrial radio access network ') measures.In the 5.2.3 trifle, SIR ErrorBe defined as:
SIR error＝SIR-SIR target_ave
Wherein SIR is the signal-to-jamming ratio of being measured by UTRAN, and unit is dB, and SIRt Arget_aveTarget sir SIR TargetThe mean value that is averaged in the period identical with the signal-to-jamming ratio of being measured by UTRAN.Under compact model, SIR TargetEqual SIR Cm_targetAnd do not calculate in the emission gap.SIR TargetOn average be in lineal scale, make and SIR Target_aveTake dB as unit.
Above-cited file neither one discloses the method and system that switch in border that optimization is provided or zone, when it has the switching that has asymmetric switching scope aspect carrying out distance or emission power of pilot channel, to the power control of continuous transmission power of mobile station.
Summary of the invention
When soft handover that design will be set up such as the institute's received power of the CPICH in the WCDMA system based on pilot channel, different switch or the signal quality of diversity branch may be significantly different.In addition, the signal quality that receives may be significantly different with the down link direction for the up link of a connection.This problem usually in for example WCDMA and ofdm system be inevitable with.
In the reason for this, have:
At the noise of the diversity branch in place, base station or interference level significantly greater than noise or the interference level of another diversity branch in a base station.
2. be relevant in the make progress residential quarter of the transmitting power that receives of downlink side and cover significantly to be different from and be relevant to the residential quarter covering of UE place with regard to SIR or SINR.
3. antenna diagram, radiation pattern or the area of coverage (footprint) can not change or will not change greatly very much because of cost.
4. the different receivers sensitivity of the base station receiver of different base station.
Therefore, need to provide the overlay pattern qualified or that optimize that is relevant to quality.
Therefore an object of the present invention is to obtain a communication system, be used for compensating different coverings or the up link of different districts or the covering of the different quality on the down link that up link and downlink side make progress.
Another purpose provides the method and system of the quality control that has nothing to do with the base station receiver performance.
Another purpose of the present invention is to obtain the method and system of the irrelevant quality control of the actual antenna gain of installing with the base station.
Another purpose provides the method and system that is adapted at the actual cell sites that the particular soft handover boundary relates to.
Last purpose is that the different requirements of the business that provides with them for various radio access bearer RAB are fully controlled cell size and optimized cell size.
These purposes are to realize by the method and system that adds noise or interference, injection noise or interference or adaptive noise equivalent level with switching relevant transmitting power control in the base station receiver path.
According to one aspect of the present invention, a kind of method that radio communication connects of switching is provided, this radio communication comprises the radiofrequency signal that receives and the radiofrequency signal of launch'sing base radio coverage, the method is characterized in that, the down link of different base station or the radio coverage imbalance between the uplink direction compensate by noise or interference are joined one or more signals that receive, and wherein add noise or interference and noise or disturb only to be added into the radio link that the SIR error is lower than thresholding after the despreading of the radio link that is in soft handover.
Preferably, the noise that adds or interference are in response to the particular requirement of radio access bearer or are determined by one or more business that described radio access bearer provides.
Preferably, when obtain synchronously to the up link of base station, when this base station is different from the base station that has added noise or interference, described noise or disturb to add and be interrupted.
Preferably, when noise or disturb to add when being interrupted, the transmitting power control that has added the base station of noise or interference can order the subscriber equipment relevant with described noise or interference adding to increase transmitting power, until finish switching or noise or disturb the interrupted described base station of adding no longer to be in the activity group of this subscriber equipment.
According to another aspect of the present invention, a kind of radio communication base station is provided, radio coverage with the radiofrequency signal that receives and the radiofrequency signal of launching, described radio communication base station is characterised in that: detector means, and uneven for detection of down link or the radio coverage between the uplink direction about another base station; And compensation arrangement, comprise for noise or interference are joined the noise of one or more signals that receive or disturb adder; Wherein after the despreading of the radio link that is in soft handover, add noise or interference and noise or disturb and only be added into the radio link that the SIR error is lower than thresholding.
Preferably, described compensation arrangement is arranged in response to the particular requirement of radio access bearer or one or more business of being provided by described radio access bearer, and adds noise or interference.
Preferably, when obtain synchronously to the up link of base station, when this base station is different from the base station that has added noise or interference, this noise or disturb to add and be interrupted.
Preferably, when noise or disturb to add when being interrupted, processing unit control has added the transmitting power control of the base station of noise or interference, increase transmitting power to order and described noise or interference to add relevant subscriber equipment, until finish switching or noise or disturb the interrupted base station of adding no longer to be in the activity group of subscriber equipment.
Description of drawings
Fig. 1 shows for respectively serving a residential quarter " residential quarter 1 ", two base stations " BS1 " of " residential quarter 2 ", " BS2 ", the diversity switching of user equipment (UE) or the principle of soft handover.
Fig. 2 schematically shown according to prior art on CPICH from the hysteresis of institute's received power of two different base station/Node B.
Fig. 3 shows code-division multiplexing system such as the data rate/subchannel of WCDMA system and the correlation between subcode/spreading factor.
Fig. 4 shows for example antenna coverage patterns down link and up link, on the horizontal plane of two base stations, the Zone switched example of Zone switched and according to the present invention up link together with the down link of prior art.
Fig. 5 has schematically shown by the up-link transmission power " UL TP " of subscriber equipment emission and the relation curve of the position of subscriber equipment.
Fig. 6 has schematically shown the relation curve that is launched into the position of the down-link transmitting power of subscriber equipment and subscriber equipment when special user equipment during along the imagination traveling priority between two base stations of Fig. 4.
Fig. 7 show to be similar to Fig. 4 those, the example of the scope that is used for the specific user of the example antenna coverage patterns form on the horizontal plane of two base stations.
Fig. 8 has schematically shown the up-link transmission power of subscriber equipment and the relation curve of position, and this subscriber equipment is along the straight line of the imagination, mobile in the direction of the base station with less uplink coverage " BS A " in the base station that has larger uplink coverage from Fig. 7.
Fig. 9 has schematically shown the relation curve of the position of base station down link transmitting power and special user equipment, and this subscriber equipment is along the straight line between two base stations, mobile in the direction of the base station that less uplink coverage is arranged in the base station that larger uplink coverage is arranged from two Zone switched examples of Fig. 7.
Figure 10 illustrates according to alternative of the present invention, that inject carry out noise in the receiver path by example flow, according to the present invention, second embodiment is determining that TPC (' transmitting power control ') bit adds to send the power control algorithm control noise that is used for up-link transmission power control.
Figure 11 shows the theory diagram of the relevant portion of the base station of work according to the present invention.
Embodiment
When soft handover that design will be set up such as the received power of the CPICH in the WCDMA system based on pilot channel, different switch or the signal quality of diversity branch may be significantly different.And the signal quality that receives may be significantly different owing to the imbalance of up link and down link with the down link direction for the up link of a connection.This difference can depend on the UE position or to the instant distance of base station.Be relevant to quality, this difference causes the asymmetric of covering.This problem normally for example in WCDMA and the ofdm system inevitable with.
This reason that becomes problem has five parts at least:
When disturb or noise level to the uplink direction of two or more base stations significantly not simultaneously, power control algorithm will be tending towards making transmitting power to remain on the minimum possible level, and this transmitted power level will rather than provided enough quality by place, the base station of serious disturbance at the place, base station with little interference and noise level.Therefore, will very littlely maybe can ignore from one or more diversity gains with additional branches of serious noise or interference.
* this may cause for effective use of resource, and it is too of a specified duration that old residential quarter is held, or be equally, and is too far away apart from the base station of serving this old residential quarter to the handoff boundary of a handoff candidate.
* another result is: by other user of the base station of serious disturbance, owing to being with to the disturbance user of institute not or have insignificant performance gain to set up the soft handover diversity branch road, cause interference level to increase for.
2. be based on the power level that receives rather than based on the quality measure relevant with power control, during such as SIR or SINR, exist because little SIR or SINR make the risk increase of the one or more communication leg step-outs that obtain the base station when switching.This will increase the risk of call drop.
3. the WCDMA system of today is usually designed to the power level that makes CPICH and arranges comparably at the antenna connector place of transmitting base station, makes the CPICH power level be set to the function of total available horsepower at place, base station.Handoff boundary is arranged based on the CPICH power level that receives, and cell boarder can only be controlled by antenna ra-diation pattern.
* the antenna ra-diation pattern that changes may be unavailable in old antenna is installed.
* the type that depends on antenna, the antenna ra-diation pattern of variation may be too dull or too expensive.
Therefore, often can not be relevant to the surface distributed of variation of traffic carrying capacity and adaptive antenna ra-diation pattern, it may come to an end with the too much calling that gets clogged.
4. when determining handoff boundary with respect to the power on the CPICH that receives from different base stations, do not consider the possible different sensitivity of the receiver of different base station.This may the desired user equipment transmitting power of appreciable impact different base station.Therefore, there is the risk that causes call drop owing to the receiver sensitivity of being indifferent to reality.
5. traffic capacity will be aspect the piece speed that increases, particularly owing to can't switch in the residential quarter with relatively poor down link covering and worsening, thus overslaugh capacity optimization.
According to the present invention, the Functionality, quality and appealing design selection of land is measured according to signal-to-jamming ratio SIR or the signal ratio SINR with interference and noise.Equally according to the present invention, in fact can use with described power control institute based on estimate any quality measure that concerns very by force arranged.
The present invention also helps to solve the Power Control Problem of the direct-cut operation in the cdma system of describing in the International Patent Application WO 0232017.
In code division multiple access, each digital subscriber signal is come separately by independent spreading code.Each code represents a spreading factor.Subchannel or low-rate channel are by the subcode with larger spreading factor separately.Fig. 3 shows for code-division multiplexing system such as the data rate/subchannel of WCDMA system and the correlation between subcode/spreading factor.It has shown a binary code tree, wherein equals 1 spreading factor SF and has occupied whole code tree, all ranks that namely represented by SF=2, SF=4, SF=8 and SF=16.This spreading factor changes into the highest user data rate.Have the subcode that equals 2 spreading factor and only occupy tree half, leftmost subtree or rightmost subtree, in each case, subtree has occupied by SF=4, SF=8 and the represented rank of SF=16, thereby prevents that other user from using corresponding code.Similarly, if the user is endowed corresponding to the subcode that equals 4 spreading factor, he occupies and comes from level other subtree down to SF=16 (with the subchannel of correspondence) that represents with SF=4 so.The medium user data rate of spreading factor 4 representatives.The user who is assigned with the channel of spreading factor 16 occupies minimum data rate in the figure of this example.Be indicated on the root of corresponding subtree for the spreading code of SF=1, SF=2 and SF=4.This code tree only is an example, is not to limit the scope of the invention.
According to a preferred embodiment of the invention, in the WCDMA system, for used subscriber equipment, noise or interference are to join adaptively the signal that receives at least one up link, and have therefore compensated at the different capacity level of selected or the CPICH of cell boarder place that optimizes or have compensated different uplink qualities in the different up links at the existing cell boarder place that determines according to the power level of the CPICH that receives.If noise is added into RF (' radio frequency ') receiver path, then all radio links may be subject to the impact of noise.Therefore preferably, noise is to be added into after the specific user's despreading for the received signal in the WCDMA system.According to preference pattern of the present invention, before depending on the further despreading of the capacity that distributes, when all radio links used the SF=4 despreading, noise was added into after using spreading factor 4 (SF=4) despreading.Noise can also inject by the spreading factor place in regioselective despreading step or selection, and is added into one group of user.
Similarly, in the example ofdm system, wherein the user shares a large amount of carrier waves and is assigned with the capacity of the shared carrier wave of institute, and noise preferably is added into after the signal of, enhancing specific user's that receive of filtering or inverse transformation signal component.
Particular problem as up link and the unbalanced example reason of downlink signal level is: the mast of installing in the base station that is used for uplink signal has used push rod (top mast) amplifier TMA or low noise amplifier LNA.TMA amplifies the signal that receives and comes comfort noise and to the decay of the antenna cable of base station according to principle known in the art near feeder (feeder) point, and improves thus the sensitivity of installing.Yet make progress at downlink side, noise and decay must be by base-stations compensate.In launch at antenna feeder point place and the particular feedback of received signal level, this coupling is not desirable scarcely ever.In addition, the antenna ra-diation pattern that transmits and receives antenna is seldom ideally mated.And CPICH is subject to the CPICH function of base station maximum transmission power and base station transmitting power.
By mobile auxiliary switching MAHO, subscriber equipment is measured the downlink signal level of the Common Pilot Channel CPICH that receives.
Fig. 4 shows the example ranges for the specific user of example antenna coverage patterns form up link " UL A ", " UL B " and down link " DLA ", " DL B ", on the horizontal plane of two base stations " BS A " and " BS B ".In more detail, the solid line of each coverage pattern represent for given transmitted power level, the specific incoming level of the subscriber equipment of transmitting/receiving signal at work.In the drawings, uplink coverage " UL A ", " UL B " are basic identical for two base stations " BS A ", " BS B ".Downlink coverage " DL A ", " DL B " are for two base stations " BS A ", " BS B " remarkable difference.This may be to cause owing to for example base station " BS A ", " BS B " use different CPICH power level work.In some existing installation, the decay of antenna feeder cable is significantly different between the base station.For down link, in order to keep the connection of any one travelling carriage that moves in base station " BS A ", " the BS B ", crucial is: the switching that down link connects is set up within overlay area " the HO zone of DL key ".
When allowing down link to cover and downlink capacity also affects up link when Zone switched, according to the present invention, the switching of up link also will occur in compared to the up link overlay pattern represented, Zone switched " the HO zone of DL key " of the base station " BS B " that covers of more close more limited down link in position.
Fig. 5 has schematically shown by the up-link transmission power " UL TP " of subscriber equipment emission and the relation curve of the position of subscriber equipment.In the drawings, location of user equipment is along the imagination traveling priority between the base station shown in Fig. 4 " BS A ", " the BS B ", and base station " BS A ", " BS B " have those the overlay pattern that is used for subscriber equipment in the corresponding diagram 4.In Fig. 5, subscriber equipment is in the direction of " BS B " mobile " UL TP (A → B) " from base station " BS A " with suitable large coverage towards the base station with less coverage.A feature is to descend more smoothly according to the switching of only determining based on down-link transmitting power " conventional UL TP " that transmitting power of the present invention " the UL TP that Q determines " (solid line) is controlled as than routine.This will cause with entering residential quarter in routine switch the little increased power " UL TP increase " compare.By its smooth change with respect to distance, this can come balance by the noise/interference of other user's injection.
Fig. 6 has schematically shown the relation curve of the down-link transmitting power that is launched into subscriber equipment when the imagination traveling priority of special user equipment along two base stations " BS A " of Fig. 4, between " BS B " " DL TP (A → B) " " PA → B " and the position of subscriber equipment.In fact, down-link transmitting power comprised before switching from the transmitting power of the base station of large coverage " BSA " " DL TP A " more, with when switching has been performed, comprise the transmitting power " DL TP B " from more among a small circle base station " BS B ", this switching is illustrated as the dotted line " the HO border that Q determines " that appears at the left side and locates.
Fig. 7 show be similar to Fig. 4 those, the specific user's of the example antenna coverage patterns form on the horizontal plane of two base stations " BS A ", " BS B " example ranges.The down link of base station " BSA ", " BS B " covers " DL A ", " DL B " is identical with Fig. 4's.Contrast Fig. 4, Fig. 7 comprise that some the different up link about two base stations of subscriber equipment covers " UL A ", " UL B ".The scope difference may be that disturbance situation or the different sensitivity owing to for example base station receiver causes.Except Fig. 4, also comprised second Zone switched " the HO zone of UL key ".In this zone, in order to keep towards the base station connection of the mobile travelling carriage of one of " BS A ", " BS B ", crucial is to have set up the switching that up link connects.For this example coverage, when when the direction from base station B to base station A moves, use conventional switching meeting because subscriber equipment can not be synchronous with the base station that less uplink coverage is arranged " BS A ", lose the great risk of connection and exist.This will further be explained according to Fig. 8 and 9.
Fig. 8 has schematically shown along the straight line of the imagination, at the base station that has larger uplink coverage from Fig. 7 " BS B " relation curve of up-link transmission power " UL TP (B → A) " and the position of mobile subscriber equipment in the direction of the base station with less uplink coverage " BS A ".For the switching of routine, along with subscriber equipment further from the base station that it is just leaving, it will increase up-link transmission power " conventional UL TP ".Along with before the subscriber equipment and then the base station " BS B " of more just leaving away from it, required up-link transmission power " conventional UL TP ", " UL TP " are larger.This situation is continued until that the base station " BS A " of subscriber equipment and its positive convergence is synchronous.Because by the less uplink coverage of the base station of convergence " BS A " and the limited transmitting power of UE, switch " conventional HO border " for routine, require the UE beguine more to be close to by the base station of convergence " BS A " when of the present invention.Therefore, interference level increases in by the cell/section of being served by the base station of convergence " BS A ", and it be not carried out compensation with same meaning according to the present invention.According to " the UL TP that Q determines " of the present invention, because aforesaid noise injects, subscriber equipment has increased transmitting power " UL TP ".Because increased power, to compare with the situation of the switching " conventional handoff boundary " of routine, subscriber equipment can be obtained with the base station " BS A " of its positive convergence on the position of the more close base station that it is just leaving synchronously.According to the present invention, uplink handover boundary can be close to down link handoff boundary (depending on hysteresis level) " the HO border that Q determines ", and the possible interference increase in the residential quarter that the base station " BS B " that UE is just leaving is served can come balance by the noise injection with to the selection that lags behind.
Fig. 9 has schematically shown the relation curve of base station down link transmitting power " DL TP (B → A) " and the position of special user equipment, and this special user equipment is along the straight line between two base stations " BSA ", " the BS B ", mobile in the direction of the base station that less uplink coverage is arranged in base station " BS A " that larger uplink coverage is arranged from two Zone switched examples of Fig. 7.Down-link transmitting power is relevant with the up-link transmission power among Fig. 8.As explaining according to Fig. 8, the up-link transmission power of " conventional UL TP " is switched in use according to routine, require UE than using the situation according to the up-link transmission power for the UE up link of the present invention " the UL TP that Q determines " relatively more to be close to by the base station of convergence, with the switching that obtains synchronous regime and will carry out.This may be since for example away from the larger sensitivity of base station " BS B " showed wider up link and covered.This causes also the difference about down link.With reference to Fig. 9, according to the switching transmitting power of routine " conventional DL TP B ", from away from " the DL TP B " of base station " BS B " be required to increase " TP exceeds (excess) " other, that " conventional DL TP B " compares with switching according to the present invention " the DL TP that Q is definite ".Since away from the down link scope that covers less than the base station " BS A " of institute's convergence of discussing according to Fig. 7 of the down link scope of base station " BS B " cover, so except the negative effect of the transmitting power that increases, also exist UE to lose the great risk of connection owing to the radio uplink of the base station to institute's convergence that is not established " BS A ", it may be not cause synchronously owing to up link in the expiration time that switches obtains.Yet according to the present invention, because the up link of be used for switching can be set up as more be close to this away from base station " BS B ", so can satisfy prerequisite, allow and finish satisfactorily in the centre between the border for the handoff boundary " the HO border of DL key " that switches in and UL key crucial near DL of up link and down link, " the HO border of UL key ".Obviously, Fig. 9 shows according to two advantages of the present invention: reduced " TP exceeds " down-link transmitting power " DL TP (B → A) ", " DL TP A ", " DL TP B " and reduced owing to UE with away from the down link scope that is connected to of base station " BS B " cover to lose outside " the crucial border of DL " and lose the risk that is connected synchronously.The conventional larger down-link transmitting power that switches increased by by the residential quarter of the base station of convergence " BS A " service and by away from the residential quarter served, base station " BS B " in interference level.Contrast situation about switching according to up link of the present invention described above, this disturbs to increase and is not balanced.In addition, conventional switching will arrange additional restriction in low hysteresis level, as a trial that reduces risk of dropped calls.
For the advantage of the present invention that obtains to describe according to Fig. 4-9, except the noise that may inject at (by convergence) base station A place, be confirmed as (take dB as unit or use logarithmic scale) in the preferred power level of noise of (away from) base station B place injection:
N BA＝P CPICH，A-P CPICH，B-S BS，A+S BS，B，
Wherein, for the connection of the base station A that arrives Serving cell A that is established, N BAIt is the power level difference that is relevant to residential quarter A for the noise handoff boundary between residential quarter A and the B, that inject at base station B place; P CPICH, AIt is the transmitting power from base station A that in UE, receives at boundary; P CPICH, BIt is the transmitting power from base station B that in UE, receives at boundary; S BS, AIt is the receiver sensitivity of base station A; And S BS, BIt is the receiver sensitivity of base station B.
As alternative, the noise injection level is determined (take dB as unit or use logarithmic scale) independently at place, each base station:
N A＝C+S BS，A-P CPICH，A，
N B＝C+S BS，B-P CPICH，B，
Wherein, N ANoise injecting power level and the N at A place, base station BBe the noise injecting power level at B place, base station, and C is constant, it preferably is set to equal 0.Preferably noise only is injected into conditionally, condition be the base station be away from the base station or have one or more base stations to the links of subscriber equipment of having set up (for base station A as by the base station of convergence and for base station B as away from the situation of base station in, N A=0), installs for great majority thus, maximized shock effect (impact) and kept the Noise and Interference level for minimum.
N BA=N B-N AAbsolute value | N BA| the reflection relatively power of the noise injection of residential quarter exceeds.If situation is so that according to the N of top expression formula BAPositive for two residential quarters-residential quarter A and residential quarter B, power level of noise so | N BA| be added on the receiver path of base station B.Only the positive power level of noise be introduced on the receiver path.If according to top expression formula, N BAFor by the residential quarter A of convergence and away from residential quarter B will bear, then preferably do not add noise.
Should see, noise or interference should only be injected into the link in synchronous.In addition, noise or interference should preferably only be injected into the SIR error and be lower than for example link of 2dB of certain threshold, in order to only adjust handoff boundary with receiver sensitivity when necessary the time.If the SIR error surpasses certain threshold, then according to the present invention, this may be because UE is operated on its maximal power level, and can not further increase it.Preferred specific SIR error threshold depends on the configuration of the external power control ring among control RNC, the CRNC.
As to the aforesaid alternative of in the receiver path, injecting noise, obtain similar result according to the second embodiment, this second embodiment is determining that TPC (' transmitting power control ') bit adds to send the power control algorithm control noise that is used for up-link transmission power control.In Figure 10, this shows by example flow chart:
-if 5 consecutive TPC bits that send from the base station are arranged, they all order UE to reduce transmitting power " TPC i＜0 ", then the noise of 1dB is added in the transmitting power control algolithm of up link, unless the noise of resulting adding surpasses maximum level " maximum noise adding ".
-if 5 consecutive TPC bits that send from the base station are arranged, they all order UE to increase transmitting power TPC i＞0 (determined TPC i" determine TPC i", " TPC i" or plus or minus), then the noise of 1dB is deducted in the transmitting power control algolithm of up link.
If-among 20 consecutive TPC bits that send from the base station, there are 10 TPC bits to represent increased power " TPC i＞0 ", and 10 TPC bits represent that power reduces " TPC i＜0 ", the noise of 1dB is added in the transmitting power control algolithm of up link so, unless the noise of resulting adding surpasses maximum level " maximum noise adding ".Consider 20 last consecutive TPC bits, counting indices modulo 20.For this reason, the oldest TPC bit " TPC I-19" impact " determine TPC for each new TPC bit value i" be eliminated.During initialization, old TPC bit value preferably is set to 0 " TPC j=0, j=1,2...19 ".When having eliminated old TPC bit value, consider the impact of determined TPC bit and do not consider initialization value TPC I-19=0.
Describe in more detail, Figure 10 shows in beginning " S0 " method of initial a plurality of parameters " S1 " for proper handling afterwards.The method of 20 TPC bits is depended in use, not yet available TPC bit (TPC j, j=1,2...19) and be initialized to 0, therefore can be different from the non-zero determined value of determining from measurement data.Counter i, k, l, m, n are set to 0.
For each iteration, the TPC bit is determined " S2 ".If transmitting power should increase, then TPC iGreater than 0, and if transmitting power should reduce, TPC then iLess than 0.
If TPC iLess than 0 " S3 ", it is as the candidate who equates continuously one of TPC bits less than 05 (k → k+1) then to consider " S4y ".Obviously, it is not greater than one of 05 TPC bits that equate continuously (l → 0).It may be less than one of 10 TPC bits of 0 (m → m+1) among 20 consecutive TPC bits.
If TPCi is not less than 0 " S3 ", it is as the candidate who equates continuously one of TPC bits greater than 05 (l → l+1) then to consider " S4n ".Obviously, it is not less than one of 05 TPC bits that equate continuously (k → 0).It can be greater than one of 10 TPC bits of 0 (n → n+1) among 20 consecutive TPC bits.
If k=5 " S5k " has then had less than 5 of 0 continuous TPC bits.So 5 consecutive TPC bits of another sequence are increased (NoiseLev → NoiseLev+1) " S6ky2 " by initial (k → 0) " S6ky1 " and noise equivalent level.If there are not 5 TPC bits that equate continuously so in k ≠ 5, but also may be among 20 continuous TPC bits greater than 10 TPC bits of 0 between " S6n ".If this is the case, then noise equivalent increases (NoiseLev → NoiseLev+1) " S6ky2 ".
Similarly, if 5 continuous non-negative TPC bits " S6ly " are arranged, so 5 consecutive TPC bits of another sequence are reduced (NoiseLev → NoiseLev-1) " S6ly " by initial (l → 0) and noise equivalent level.
Check that the noise equivalent level is not set to less than 0 " S7l ", " S8ly " and is not more than maximum horizontal MaxNoiseAdd " S7k ", " S8ky ".
The method is proceeded by progressively eliminating old TPC bit, in this example, from 20 bit (TPC I-19) the oldest bit progressively eliminated " S9 ", " S10n ", " S10y ", " S11y ".If the oldest TPC bit that is considered is less than 0 " S9 ", so the record of the quantity of negative TPC bit reduces by 1 " S11y ".If the TPC bit is not less than 0, check that so whether it is greater than 0 (perhaps whether non-zero it is) " S10n ".If the oldest TPC bit that is considered is greater than 0 " S10n ", the record of the quantity of so non-negative TPC bit reduces by 1 " S11y "." S10y ", " S11y " after suitably adjusting counter if or the TPC bit equal from an initialized initialization value " S1 ", this TPC bit iteration count and pointer of progressively being eliminated and pointing to the current location that is cushioned the TPC bit increases by 1 (i → i+1 mould 20) " S11n " so.Because considered maximum 20 continuous TPC bits, so increase " S11n " by mould 20.
Corresponding 15 TPC bits of radio frame in WCDMA.By using the considered preferably multiple of 5 TPC bits, obtain the TPC bit of every radio frame fair amount.In addition, 5 TPC bits are enough short and enough large for reliable result for short-term or real-time power control slope detection in time.The quantity (20 TPC bits) that is used for the preferred TPC bit of definite average (longer-term) slope preferably is considered for the multiple of the TPC amount of bits of short-term peaks/instant slope detection.Yet the present invention is not limited to the TPC bit of these preferred amounts, even they mean the realization advantage.
In yet another embodiment, be added between transfer period about embodiment 1 or 2 described noise/interference and initially be included to for special user equipment UE.When user equipment uplink with obtained synchronously by the base station of convergence and this switching when being performed, the noise/interference adding is interrupted, and away from (old) base station be controlled to the TPC order of transferring command increased power, therefrom effective transmitting power control is left for by the base station of convergence, because when having afoul TPC order, UE is designed to launch at least the power level of being ordered.When switching is finished, away from (old) base station stop this process.
Figure 11 shows the theory diagram of the relevant portion of the base station of work according to the present invention.The signal that receives is treated for filtering, frequency translation etc. in origination class " RF level ", come for demultiplexing or despreading and unbalanced detection thereby present suitable signal.This signal is preferably used spreading factor 4 " despreading SF=4 " and detects uneven " uneven detector " by further demultiplexing or despreading.According to the present invention, imbalance can detected in various ways.As an example, uplink signal measure can by the base station carry out and can with carried out by UE or by another base station carry out and by UE or the measurement that directly reports to this instant base station compare.Another example is that the base station value that the level reported or scope and comparison report that places one's entire reliance upon is used for determining compensation.Be fed to noise or noise or the interference of interfere generation device " noise maker " to generate suitable power level about the unbalanced information that detects.This noise or interference are fed to adder
Figure GSB00000625968200151
The noise or the interference that produce are added on the signal of institute's despreading.The signal that is synthesized is by from adder
Figure GSB00000625968200152
Output.Noise and Interference maker " noise maker " and adder be combined to form noise adder " noise adder ".
The specific acronym that the present invention is not limited to use in the specification or the particular system of mentioning.The present invention covers all systems and the equipment that is similar to described work.
Embodiment described in detail above the present invention only is not intended to be limited to.Do not deviating under the prerequisite of the present invention and can make changes and modifications.It has covered all modifications in the claim scope below.

Claims (24)

1. one kind switches the method that radio communication connects, this radio communication comprises the radiofrequency signal that receives and the radiofrequency signal of launch'sing base radio coverage, the method is characterized in that, the down link of different base station or the radio coverage imbalance between the uplink direction compensate by noise or interference are joined one or more signals that receive, and wherein add noise or interference and noise or disturb only to be added into the radio link that the SIR error is lower than thresholding after the despreading of the radio link that is in soft handover.
2. method according to claim 1 is characterized in that it is to add noise after the demultiplexing of the one or more signals that receive that described noise or interference add.
3. method according to claim 1 is characterized in that it is to add noise after the despreading of the one or more signals that receive that described noise or interference add.
4. method according to claim 3 is characterized in that the despreading of one or more signals of receiving comes the described one or more signals of despreading with spreading factor 4.
5. method according to claim 1 is characterized in that what relatively coming between the performance that the noise that adds or interference be in response to the base station with built vertical connection and the base station that will connect determined.
6. method according to claim 5 is characterized in that described Performance Ratio comprises base station receiver sensitivity.
7. method according to claim 5 is characterized in that described Performance Ratio is included in the base station transmitting power that receives in the subscriber equipment.
8. method according to claim 1 is characterized in that what relatively coming between up link that the noise that adds or interference are in response to the base station and the down-link performance determined.
9. method according to claim 1 is characterized in that particular requirement that the noise that adds or interference are in response to the radio access bearer or is determined by one or more business that described radio access bearer provides.
10. method according to claim 1 is characterized in that described interference does not join nonsynchronous radio link.
11. the described method of according to claim 1-9 each, it is characterized in that when obtain synchronously to the up link of base station, when this base station is different from the base station that has added noise or interference, described noise or disturb to add and be interrupted.
12. method according to claim 11, it is characterized in that when noise or disturb adding when being interrupted, the transmitting power control that has added the base station of noise or interference can order the subscriber equipment relevant with described noise or interference adding to increase transmitting power, until finish switching or noise or disturb the interrupted described base station of adding no longer to be in the activity group of this subscriber equipment.
13. the described method of according to claim 1-10 each is characterized in that described radio communication is based on code division multiple access or Wideband Code Division Multiple Access (WCDMA) principle.
14. according to claim 1,2, each described method of 5-10, it is characterized in that described radio communication is based on the principle of OFDM.
15. a radio communication base station has the radiofrequency signal that receives and the radiofrequency signal of launch'sing radio coverage, described radio communication base station is characterised in that:
Detector means, uneven for detection of down link or the radio coverage between the uplink direction about another base station; And
Noise or interference adder are used for noise or interference are joined one or more signals that receive;
Wherein after the despreading of the radio link that is in soft handover, add noise or interference and noise or disturb and only be added into the radio link that the SIR error is lower than thresholding.
16. radio communication base station according to claim 15 is characterized in that:
Noise or interference adder comprise noise or interfere generation device and adder, and described noise or interfere generation device are connected to adder.
17. radio communication base station according to claim 15 is characterized in that described noise or disturbs adder to comprise noise or interfere generation device and adder that described noise or interfere generation device are connected to adder; And despreading device, be used for the one or more signals that receive of despreading;
Described despreading device is connected to one or more signals that receive that this adder is used for noise or interference are joined institute's despreading.
18. radio communication base station according to claim 17 is characterized in that described despreading device is arranged for coming the described one or more signals of despreading with spreading factor 4.
19. radio communication base station according to claim 15, it is characterized in that described noise or disturb adder to be arranged in response to the particular requirement of radio access bearer or the one or more business that provided by described radio access bearer, and add noise or interference.
20. radio communication base station according to claim 15 is characterized in that described interference does not join nonsynchronous radio link.
21. the described radio communication base station of according to claim 15-19 each, it is characterized in that when obtain synchronously to the up link of base station, when this base station is different from the base station that has added noise or interference, this noise or disturb to add and be interrupted.
22. the described radio communication base station of according to claim 15-20 each is characterized in that described radio communication base station is according to code division multiple access or the work of Wideband Code Division Multiple Access (WCDMA) principle.
23. according to claim 15,16, each described radio communication base station of 19-20, it is characterized in that described radio communication base station is according to the principle work of OFDM.
24. a communication system is characterized in that comprising a plurality of each described radio communication base stations such as claim 15-23.
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